/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2013 * The President and Fellows of Harvard College. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef FREEMAP_H #define FREEMAP_H /* * The freemap module accumulates information about the free block * bitmap as other checks are made, and then uses that information * to check and correct it. */ #include <stdint.h> typedef enum { B_SUPERBLOCK, /* Block that is the superblock */ B_FREEMAPBLOCK, /* Block used by free-block bitmap */ B_INODE, /* Block that is an inode */ B_IBLOCK, /* Indirect (or doubly-indirect etc.) block */ B_DIRDATA, /* Data block of a directory */ B_DATA, /* Data block */ B_PASTEND, /* Block off the end of the fs */ } blockusage_t; /* Call this after loading the superblock but before doing any checks. */ void freemap_setup(void); /* Call this to note that a block has been found in use. */ void freemap_blockinuse(uint32_t block, blockusage_t how, uint32_t howdesc); /* Note that a block has been found where it should be dropped. */ void freemap_blockfree(uint32_t block); /* Call this after all checks that call freemap_block{inuse,free}. */ void freemap_check(void); /* Return the number of blocks in use. Valid after freemap_check(). */ unsigned long freemap_blocksused(void); #endif /* FREEMAP_H */